Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK1987ELECTRA V6-231 3.8L VIN 3 FIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULESERVICE AND REPAIR
1987 Buick Electra V6-231 3.8L VIN 3 FI
Ignition Control Module: Service and Repair
1987 Buick Electra V6-231 3.8L VIN 3 FISECTION Service and Repair
Fig. 26 C3I ignition module installation. 1984-85 models:
Fig. 27 C3I ignition module installation. 1986-87 models exc. Delta 88, LeSabre, 1987 Bonneville & 1988 V6-231(3800):
Fig. 28 C3I ignition module installation. 1986-88 Delta 88 & LeSabre & 1987-88 Bonneville:
Fig. 29 C3I ignition module installation. 1988 V6-231(3800):
1. Disconnect battery ground cable, then the ignition module 14-way connector.
2. Disconnect spark plug wires from ignition coil.
3. Remove ignition module-to-bracket attaching nuts and washers, Figs. 26 through 29.
4. Remove screws securing coil to ignition module, then disconnect coil-to-module wire connectors.
5. Remove ignition module.
6. Reverse procedure to install.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.